Vol. 5, Issue 6 (2017)
Comparison of chemical extractants for determination of available potassium
Author(s): KS Grewal, Sushil Kumar, Mohammad Amin Bhat and Dinesh
Abstract: To evaluate different methods for soil potassium availability, surface soil samples (0-15 cm) were collected from 55 locations in Haryana covering a wider range of dominant textures and management conditions. Each soil sample was then equilibrated with 0, 100, 200 and 400 mg K kg-1 soil for about a week to obtain soils with a wider spectrum of their initial K content. Available potassium in all the samples air-dried at room temperature was determined using 1N ammonium acetate (NH4OAc), Mehlich-3 (M3) and sodium tetraphenylboron (NaBPh4). The results showed that the average percent increase in available K extracted by ammonium acetate, Mehlich-3 and sodium tetraphenyl boron for 100, 200 and 400 ppm treated soils was 34.65%, 31.68%, 26.73%; 57.28%, 60.56%, 53.52% and 22.66%, 23.46% and 26.81%, respectively in comparison to 0 ppm treated soils. However, higher (2-3 times) available potassium was extracted by using sodium tetraphenyl boron in comparison to ammonium acetate and Mehlich-3 extractants. The regression model showed best fit for sodium tetraphenyl boron.
Pages: 417-423 | 1268 Views 192 Downloads
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How to cite this article:
KS Grewal, Sushil Kumar, Mohammad Amin Bhat, Dinesh. Comparison of chemical extractants for determination of available potassium. Int J Chem Stud 2017;5(6):417-423.
